Follow spark code format conventions of tab => 2 spaces

Author: ash211

core/src/test/scala/org/apache/spark/rdd/RDDSuite.scala

@@ -373,8 +373,8 @@ class RDDSuite extends FunSuite with SharedSparkContext {
       val prng42 = new Random(42)
       val prng43 = new Random(43)
       Array(1, 2, 3, 4, 5, 6).filter{i =>
-          if (i < 4) 0 == prng42.nextInt(3)
-          else 0 == prng43.nextInt(3)}
+        if (i < 4) 0 == prng42.nextInt(3)
+        else 0 == prng43.nextInt(3)}
     }
     assert(sample.size === checkSample.size)
     for (i <- 0 until sample.size) assert(sample(i) === checkSample(i))